Suprapermafrost organic-accumulative horizons in the tundra cryozems of northern Yakutia
Suprapermafrost organic-accumulative horizons in the tundra cryozems of northern Yakutia
复制标题
雅库特北部苔原冰冻土的超冻土有机积累层
作者：
A. V. Lupachev;S. V. Gubin
在北方雅库特冻原地带的河间表面上发育的冻土剖面中，描述了多年冻土层之上的有机物积累层。这些冻土层中的有机质含量与表层中的有机质含量相当，甚至超过表层中的有机质含量。季节性解冻的动态表明，这些层位的物质每年都进入活跃的成土带，或者在冻结状态下被排除在成土带之外。对科雷马低地沿着1000公里长的亚纬度样带的冻土层形态的分析表明，原始有机物质（主要是不同分解的泥炭）在冻土层上方的积累和迁移是在当地因素（土壤湿润、冰含量、冻融条件、冻土层的纳米地形等）的特定组合下发生的。在有源层的下边界处。在多年冻土层的原有机材料的积累可以反映在这些视野的实质性特征，并应考虑到分类的决定。
Organic-accumulative horizons above the permafrost table have been described in the profiles of cryozems developing on interfluve surfaces in the tundra zone of northern Yakutia. The organic matter content in these suprapermafrost horizons is comparable with or even exceeds the organic matter content in the surface horizons. The dynamics of seasonal thawing specify the annual involvement of the material of these horizons into the zone of active pedogenesis or its exclusion from it in the case of their frozen state. The analysis of the morphology of cryozems of the Kolyma Lowland along a 1000-km-long sublatitudinal transect shows that the accumulation and migration of raw organic materials (predominantly, differently decomposed peat) above the permafrost table take place upon the particular combinations of local factors (the soil moistening, ice content, freezing-thawing conditions, nanotopography of the permafrost table, etc.) at the lower boundary of the active layer. The well-pronounced accumulation of the raw organic material in the suprapermafrost horizons can be reflected in the substantive characteristics of these horizons and should be taken into account in classification decisions.